package main

import (
	"fmt"
	"log"
)

func main() {
	log.SetFlags(log.Lshortfile)
	var h, m int
	fmt.Scanf("%d:%d", &h, &m)
	m += 5
	if m > 59 {
		m %= 60
		h++
	}
	h %= 24
	fmt.Printf("%02d:%02d\n", h, m)
}